--- src/lib.rs.before
+++ src/lib.rs.experiment
@@ -594,7 +594,10 @@
                 state: Rc::downgrade(self),
                 request: r.clone(),
             },
-        )?;
+        )?
+        .bind(py)
+        .getattr(pyo3::intern!(py, "send"))?
+        .unbind();
         let receive = Py::new(
             py,
             Receiver {
@@ -741,7 +744,7 @@
 }
 #[pymethods]
 impl Sender {
-    fn __call__(&self, py: Python<'_>, msg: &Bound<'_, PyDict>) -> PyResult<Py<PyAny>> {
+    fn send(&self, py: Python<'_>, msg: &Bound<'_, PyDict>) -> PyResult<Py<PyAny>> {
         let s = self
             .state
             .upgrade()